The egison package

An interpreter for the programming language Egison.
A feature of Egison is the strong pattern match facility.
With Egison, you can represent pattern matching for unfree data intuitively,
especially for collection data, such as lists, multisets, sets, and so on.
This package include sample Egison program codes *-test.egi in sample/ directory.
This package also include Emacs Lisp file egison-mode.el in elisp/ directory.